Renesas R-Car SoCs include the timing controller (TCON) that can directly
drive LCDs. It receives the H/VSYNC, etc. from the Display Unit (DU) and
converts them to the set of signals that a LCD panel can understand (the
RBG signals are effectively passed thru). Add the DRM connector driver for
the LCDs connected via the TCON interface...
Based on a large patch by Andrey Gusakov.
Signed-off-by: Andrey Gusakov <andrey.gusakov@xxxxxxxxxxxxxxxxxx>
Signed-off-by: Sergei Shtylyov <sergei.shtylyov@xxxxxxxxxxxxxxxxxx>
---
drivers/gpu/drm/rcar-du/Makefile | 1
drivers/gpu/drm/rcar-du/rcar_du_encoder.c | 5 +
drivers/gpu/drm/rcar-du/rcar_du_tconcon.c | 125 ++++++++++++++++++++++++++++++
drivers/gpu/drm/rcar-du/rcar_du_tconcon.h | 23 +++++
4 files changed, 154 insertions(+)
Index: linux/drivers/gpu/drm/rcar-du/Makefile
===================================================================
--- linux.orig/drivers/gpu/drm/rcar-du/Makefile
+++ linux/drivers/gpu/drm/rcar-du/Makefile
@@ -4,6 +4,7 @@ rcar-du-drm-y := rcar_du_crtc.o \
rcar_du_group.o \
rcar_du_kms.o \
rcar_du_lvdscon.o \
+ rcar_du_tconcon.o \
rcar_du_plane.o \
rcar_du_vgacon.o
Index: linux/drivers/gpu/drm/rcar-du/rcar_du_encoder.c
===================================================================
--- linux.orig/drivers/gpu/drm/rcar-du/rcar_du_encoder.c
+++ linux/drivers/gpu/drm/rcar-du/rcar_du_encoder.c
@@ -24,6 +24,7 @@
#include "rcar_du_kms.h"
#include "rcar_du_lvdscon.h"
#include "rcar_du_lvdsenc.h"
+#include "rcar_du_tconcon.h"
#include "rcar_du_tconenc.h"
#include "rcar_du_vgacon.h"
@@ -194,6 +195,10 @@ int rcar_du_encoder_init(struct rcar_du_
ret = rcar_du_vga_connector_init(rcdu, renc);
break;
+ case RCAR_DU_ENCODER_TCON:
+ ret = rcar_du_tcon_connector_init(rcdu, renc, con_node);
+ break;
+
case DRM_MODE_ENCODER_TMDS:
ret = rcar_du_hdmi_connector_init(rcdu, renc);
break;
Index: linux/drivers/gpu/drm/rcar-du/rcar_du_tconcon.c
===================================================================
--- /dev/null
+++ linux/drivers/gpu/drm/rcar-du/rcar_du_tconcon.c
@@ -0,0 +1,125 @@
+/*
+ * rcar_du_tconcon.c -- R-Car Display Unit TCON Connector
+ *
+ * Copyright (C) 2015-2016 Cogent Embedded, Inc. <source@xxxxxxxxxxxxxxxxxx>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ */
+
+#include <drm/drmP.h>
+#include <drm/drm_atomic_helper.h>
+#include <drm/drm_crtc.h>
+#include <drm/drm_crtc_helper.h>
+#include <drm/drm_encoder_slave.h>
+
+#include <video/of_display_timing.h>
+#include <video/videomode.h>
+
+#include "rcar_du_drv.h"
+#include "rcar_du_encoder.h"
+#include "rcar_du_kms.h"
+#include "rcar_du_tconcon.h"
+
+struct rcar_du_tcon_connector {
+ struct rcar_du_connector connector;
+
+ struct {
+ unsigned int width_mm; /* Panel width in mm */
+ unsigned int height_mm; /* Panel height in mm */
+ struct videomode mode;
+ } panel;
+};
+
+#define to_rcar_tcon_connector(c) \
+ container_of(c, struct rcar_du_tcon_connector, connector.connector)
+
+static int rcar_du_tcon_connector_get_modes(struct drm_connector *connector)
+{
+ struct rcar_du_tcon_connector *tconcon =
+ to_rcar_tcon_connector(connector);
+ struct drm_display_mode *mode;
+
+ mode = drm_mode_create(connector->dev);
+ if (mode == NULL)
+ return 0;
+
+ mode->type = DRM_MODE_TYPE_PREFERRED | DRM_MODE_TYPE_DRIVER;
+
+ drm_display_mode_from_videomode(&tconcon->panel.mode, mode);
+
+ drm_mode_set_name(mode);
+ drm_mode_probed_add(connector, mode);
+
+ return 1;
+}
+
+static const struct drm_connector_helper_funcs connector_helper_funcs = {
+ .get_modes = rcar_du_tcon_connector_get_modes,
+ .best_encoder = rcar_du_connector_best_encoder,
+};
+
+static enum drm_connector_status
+rcar_du_tcon_connector_detect(struct drm_connector *connector, bool force)
+{
+ return connector_status_connected;
+}
+
+static const struct drm_connector_funcs connector_funcs = {
+ .dpms = drm_atomic_helper_connector_dpms,
+ .reset = drm_atomic_helper_connector_reset,
+ .detect = rcar_du_tcon_connector_detect,
+ .fill_modes = drm_helper_probe_single_connector_modes,
+ .destroy = drm_connector_cleanup,
+ .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
+ .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
+};
+
+int rcar_du_tcon_connector_init(struct rcar_du_device *rcdu,
+ struct rcar_du_encoder *renc,
+ /* TODO const */ struct device_node *np)
+{
+ struct drm_encoder *encoder = rcar_encoder_to_drm_encoder(renc);
+ struct rcar_du_tcon_connector *tconcon;
+ struct drm_connector *connector;
+ struct display_timing timing;
+ int ret;
+
+ tconcon = devm_kzalloc(rcdu->dev, sizeof(*tconcon), GFP_KERNEL);
+ if (tconcon == NULL)
+ return -ENOMEM;
+
+ ret = of_get_display_timing(np, "panel-timing", &timing);
+ if (ret < 0)
+ return ret;
+
+ videomode_from_timing(&timing, &tconcon->panel.mode);
+
+ of_property_read_u32(np, "width-mm", &tconcon->panel.width_mm);
+ of_property_read_u32(np, "height-mm", &tconcon->panel.height_mm);
+
+ connector = &tconcon->connector.connector;
+ connector->display_info.width_mm = tconcon->panel.width_mm;
+ connector->display_info.height_mm = tconcon->panel.height_mm;
+
+ ret = drm_connector_init(rcdu->ddev, connector, &connector_funcs,
+ DRM_MODE_CONNECTOR_TCON);
+ if (ret < 0)
+ return ret;
+
+ drm_connector_helper_add(connector, &connector_helper_funcs);
+
+ connector->dpms = DRM_MODE_DPMS_OFF;
+ drm_object_property_set_value(&connector->base,
+ rcdu->ddev->mode_config.dpms_property, DRM_MODE_DPMS_OFF);
+
+ ret = drm_mode_connector_attach_encoder(connector, encoder);
+ if (ret < 0)
+ return ret;
+
+ tconcon->connector.encoder = renc;
+
+ return 0;
+}
Index: linux/drivers/gpu/drm/rcar-du/rcar_du_tconcon.h
===================================================================
--- /dev/null
+++ linux/drivers/gpu/drm/rcar-du/rcar_du_tconcon.h
@@ -0,0 +1,23 @@
+/*
+ * rcar_du_tconcon.h -- R-Car Display Unit LVDS Connector
+ *
+ * Copyright (C) 2015-2016 CogentEmbedded, Inc. <source@xxxxxxxxxxxxxxxxxx>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ */
+
+#ifndef __RCAR_DU_TCONCON_H__
+#define __RCAR_DU_TCONCON_H__
+
+struct rcar_du_device;
+struct rcar_du_encoder;
+struct rcar_du_panel_data;
+
+int rcar_du_tcon_connector_init(struct rcar_du_device *rcdu,
+ struct rcar_du_encoder *renc,
+ struct device_node *np);
+
+#endif /* __RCAR_DU_TCONCON_H__ */
